Device for operating grindstones.



PATENTBD JULY 16, 1907-.

v T. ,P. HOPKINS. DEVICE FOR orsmzrme GRINDSTONES.

A PPLIOATION FILED JAN. 3, 1906. Y

' S-BHBETB-SHEBT 1.

No. 860,092. PATENTED JULY 16, 1907.

- T. F. HOPKINS. DEVICE FOR OPERATING GRINDSTONES;

APPLICATION FILED JAN. 3, 1906.

2 SHEETS-311E212.

qWi'tMeo o ao 'THOMAS F. HOPKINS, OF PUXICO, MISSOURI.

DEVICE FOR OPERATING GRINDSTONES.

Specification of Letters Patent.

Patented July 16, 1907.

Application filed January 3, 1906. Serial No. 294,423.

To all whom it may concern:

Be it known that I, THOMAS F. Horxms, acitizen of the United States,residing at Puxico, in the county of Stoddard, State of Missouri, haveinvented certain new and useful Improvements in Devices for OperatingGrindstoncs; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to grind stones and more particularly to footpower grind stones and has for its object to provide a stone which willbe simple in arrangement and which may be produced at a comparativelylow figure.

Another object is to provide a stone including an adjustable seat.

Other objects and advantages will be apparent from the followingdescription.

In the drawings forming a portion of this specification and in whichlike numerals of reference indicate similar parts in the several views,Figure l is a side elevation of the present invention. Fig. 2 is a topplan view. Fig. 3 is a longitudinal section on line 33 of Fig. 2. Fig. 4is a cross section on line 4-4 of Fig. 2.

Referring now to the drawings, the present invention comprises spacedparallel sills 5 disposed horizontally and connected at their rearwardends by means of a cross piece 6. Downwardly divergent legs 7 aresecured to the rearward ends of the sills and have a cross brace 8,upwardly and forwardly extending brace rods 9 being also secured to thelegs 7 and to the sills. Between the forward ends of the sills, there isdisposed a horizontal board 10 which is secured in position bytransverse bolts 11 and this board extends forwardly beyond the sillsand has secured to its forward end a supporting leg 12, this leg beingconnected with the rearward end of the board 10 by meansof a diagonal isjournaled in the crank hanger and carries cranks 19 provided with pedals20, and the crank shaft carries a sprocket 21.

A pair of notched bars 22 are secured horizontally upon the inner facesof the sills 5 and latch rods 23 are provided and are pivoted to thesills for movement into and out of position to close the notches, thelatter being directed upwardly. A grind stone 24 is disposed with theends of its axles 25 in a pair of the notches of the bars, the notchesof the two bars registering and the axle is arranged for interchangeableengagement in the several registering pairs of notches and may thus beshifted longitudinally of the sills. The axle carries a sprocket wheel26 which is connected with the sprocket wheel 21 by means of a chain 27,the bars 22 lying rearwardly of'the sprocket wheel 21, and the shiftingof the axle thus results in variation of the tension of the chain.

The board 10 is longitudinally slotted, as shown at 28, and a clampingbolt 29 is slidably engaged in this slot and is engaged at its upper endin the nose 30 of a saddle 31 which rests upon the board. The saddle isthus movable longitudinally of the board, as will be understood and theclamping bolt may be operated to hold it at different points of itsmovement.

A water tank 32 is located in position to discharge upon the stone 24.

What is claimed is:

In combination, a pair of spaced horizontal sills; a horizontal barsecured to the inner face of each sill and having its 'upper edgeprovided with a series of notches, the notches of the two barsregistering in pairs; a driving shaft located below the sills andforwardly of said bars; a sprocket wheel mounted upon said shaft, andpedals for operating it; a driven shaft adapted to carry a grindstoneand having its opposite ends in interchangeable engagement in saidnotches; a sprocket wheel mounted on said THOMAS F. HOPKINS.

Witnesses ALBERT KELL, C. CLUBB.

